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The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?After "dying" once, Allie completely gave up the idea of suicide. "I always thought I could go to death calmly. But I found that not only did I not have it, but I was scared to death." Ally said.秋犁和宁小燕大学毕业分手五年后重逢并重拾爱情，正当他们准备结婚时，却引来双方父母的百般阻挠，还引出了深埋在上一辈人心底30年的秘密。（其实蒲俊才是第一个，但尹旭还不知道他就是历史上战绩卓著的蒲将军香荽瞪大眼睛道：这么多东西，都把你？玉米虽然很想独吞，但明知是不可能的，眼珠一转，便挑了一小块肉干递给三姐姐，道：给你吃。"In this way, given the situation at that time, it should be extremely unfavorable to the defense of position 149. So many giant" killer bees "besieged you. If not handled properly, it could even lead to complete annihilation. How did you tide over the difficulties at that time?"魏铜听了这话皱眉不语，粗糙的面颊沐浴在月色下，蒙上一层朦胧的光晕，增添了几许柔和。